Bell System Practices 550 1A2 Key System Service Manual
This page identifies the Bell System Practices documentation available for the 550 1A2 Key System. The exact records listed below are included in the complete digital Bell System Practices collection.
Documentation availableDigital delivery by email
Open Bell System Practices Bundle — Part 1
The complete collection requires Part 2 as well. Individual documents are not sold separately.
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Available documentation
- 518-215-407 SERVICE 550- AND 551-TYPE 1A2 KEY TELEPHONE SYSTEM KEY SERVICE UNITS
How these documents can help
Depending on the listed document, the material can support model identification, installation, connection checks, maintenance, servicing and historical technical research. The page does not add specifications that are not stated in the source documentation.
Bundle and delivery information
Only the complete two-part digital bundle can be purchased. After purchase, the download link is sent by email. Nothing physical is shipped.
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